The role of backstress in phase transforming steels

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Authors

  • F.D. Fischer Institute of Mechanics, Montanuniversität Leoben, Austria
  • T. Antretter Institute of Mechanics, Montanuniversität Leoben, Austria
  • F. Azzouz Ecole des Mines, Centre des Matériaux, France
  • G. Cailletaud Ecole des Mines, Centre des Matériaux, France
  • A. Pineau Ecole des Mines, Centre des Matériaux, France
  • K. Tanaka Department of Aerospace Engineering, Tokyo Metropolitan Institute of Technology, Japan
  • K. Nagayama Department of Aerospace Engineering, Tokyo Metropolitan Institute of Technology, Japan

Abstract

Transformation Induced Plasticity (TRIP) is demonstrated by an experimental programme for a Fe-9Ni-12Cr steel for various loading paths with partial or full unloading. The martensitic transformation is considered. A thermodynamical interpretation as well as micromechanical modelling of TRIP are presented. The selection of distinct variants is explained. Finally a modified constitutive equation for the TRIP strain rate is suggested by introducing a transformation surface including a transformation backstress. The backflow after unloading, which cannot be explained by the currently used TRIP strain rate term, can be represented by the proposed formulation. Aspects of future research are discussed.

Keywords:

Transformation Induced Plasticity (TRIP), Martensitic Transformation, Transformation Thermodynamics, Transformation Surface, Backstress

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